In a medium bowl, sift together the flour, baking powder, salt and sugar.

In a large bowl, lighly beat the milk, egg, melted butter and vanilla. Be careful not to overbeat as this will toughen your pancakes.

Add flour mix into the egg mixture; stir until combined.

Preheat a griddle to medium-high heat. Spray your griddle with non-stick cooking spray. Pour or scoop the batter onto the griddle, using approximately 1/4 cup for each pancake. Sprinkle top of each pancake with oreos. Brown on both sides. Serve hot and with maple syrup, if desired.